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Updated: May 21, 2026

Visualization of Gut Microbiota-host Interactions via Fluorescence In Situ Hybridization, Lectin Staining, and Imaging
Published on: July 9, 2021
Minimally invasive capsule-string device enables spatially resolved microbiome profiling across the upper
Kathryn Garvey1, J Kirk Harris2, Glenn T Furuta3
1Department of Bioengineering, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
A new capsule-string device reliably samples the upper gastrointestinal microbiome. This minimally invasive method reveals distinct microbial signatures across different gut regions, advancing microbiome research.
Area of Science:
- Microbiology
- Gastroenterology
- Biotechnology
Background:
- Characterizing regional variation in the human gastrointestinal microbiome is challenging due to limitations of current sampling methods like endoscopy or stool analysis.
- Existing techniques fail to accurately represent the upper gastrointestinal tract's microbial composition.
Purpose of the Study:
- To evaluate a novel, minimally invasive capsule-string device for collecting luminal and mucosal samples from the esophagus, stomach, duodenum, and jejunum.
- To assess the feasibility and effectiveness of this device in characterizing upper gastrointestinal microbiota.
Main Methods:
- A capsule-string device was used for natural transit sampling in healthy adults.
- Samples were anatomically localized using pH, bile staining, and string length.
- Microbial communities were profiled using 16S rRNA gene sequencing.
Main Results:
- The device was well-tolerated and successfully recovered sufficient microbial biomass from all targeted upper GI regions.
- Distinct microbial signatures were identified across different compartments, particularly between proximal (esophageal/gastric) and small intestinal communities.
- Host-specific variations were dominant, yet a reproducible regional microbial signal was consistently observed.
Conclusions:
- Capsule-string sampling offers a reliable, non-endoscopic method for obtaining spatially resolved upper gastrointestinal microbiota.
- This technique provides unprecedented access to historically inaccessible regions, enabling precise mapping of in vivo gut microbial organization.
- The approach opens new avenues for longitudinal, mechanistic, and disease-focused studies of host-microbiome interactions in the upper GI tract.
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